Traditional methods of protecting the hearing of people whowork in areas with very high noise levels have consistedmainly of efforts to block or reduce noise levels. With arelatively new technology, headphones are worn that donot block the ambient noise. Instead, a device is used whichdetects the noise, inverts it electronically, then feeds it to theheadphones in addition to the ambient noise. How couldadding more noise reduce the sound levels reaching the ears?
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
Traditional methods of protecting the hearing of people who
work in areas with very high noise levels have consisted
mainly of efforts to block or reduce noise levels. With a
relatively new technology, headphones are worn that do
not block the ambient noise. Instead, a device is used which
detects the noise, inverts it electronically, then feeds it to the
headphones in addition to the ambient noise. How could
adding more noise reduce the sound levels reaching the ears?
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